The invention discloses a method for preparing a
lignin urea-
formaldehyde pesticide microcapsule. According to the invention, the method comprises the following steps: taking modified
lignin,
formaldehyde and
urea as a
monomer, forming a water-soluble performed
polymer under base
catalysis, diluting and forming continuous phase, forming dispersed phase by
pesticide, an
organic solvent and a surfactant, mixing and stirring the continuous phase and the dispersed phase to form an oil-in-water
emulsion, performing in situ condensation
polymerization under the acidic condition, heating and solidifying, pumping
filtration and washing,
drying to obtain the
solid microcapsule particles. The modified
lignin is obtained by
formaldehyde hydroxymethyl modification of the industrial grade wheat
straw soda lignin. According to the invention, the waste wheat
straw soda lignin in paper industry is taken as the main
wall material, so that the production cost of the microcapsule can be effectively reduced and the
resource utilization of waste
biomass can be realized. The preparation method of the invention has the advantages of simple process,
rapidity and controllable microcapsule particle size, and is capable of realizing the industrial production, increasing the
pesticide utilization rate, prolonging the persistent period, minimizing the environmental
pollution in the process of agriculturalproduction, reducing the
agriculture production cost and the like, and has good market prospect.